Method for manufacturing oxide semiconductor device
First Claim
1. A method for manufacturing a semiconductor device comprising the steps of:
- forming a gate electrode layer;
forming a gate insulating layer over the gate electrode layer;
forming a metal thin film over the gate insulating layer;
forming an oxide semiconductor layer over the metal thin film;
heating the metal thin film and the oxide semiconductor layer wherein the metal thin film is oxidized entirely;
forming an oxide insulating layer in contact with a part of the oxide semiconductor layer and covering a peripheral portion and a side surface of the oxide semiconductor layer; and
forming a source electrode layer and a drain electrode layer over the oxide insulating layer.
1 Assignment
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Accused Products
Abstract
One object is to provide a semiconductor device with a structure which enables reduction in parasitic capacitance sufficiently between wirings. In a bottom-gate type thin film transistor including a stacked layer of a first layer which is a metal thin film oxidized partly or entirely and an oxide semiconductor layer, the following oxide insulating layers are formed together: an oxide insulating layer serving as a channel protective layer which is over and in contact with a part of the oxide semiconductor layer overlapping with a gate electrode layer; and an oxide insulating layer which covers a peripheral portion and a side surface of the stacked oxide semiconductor layer.
162 Citations
28 Claims
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1. A method for manufacturing a semiconductor device comprising the steps of:
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forming a gate electrode layer; forming a gate insulating layer over the gate electrode layer; forming a metal thin film over the gate insulating layer; forming an oxide semiconductor layer over the metal thin film; heating the metal thin film and the oxide semiconductor layer wherein the metal thin film is oxidized entirely; forming an oxide insulating layer in contact with a part of the oxide semiconductor layer and covering a peripheral portion and a side surface of the oxide semiconductor layer; and forming a source electrode layer and a drain electrode layer over the oxide insulating layer. - View Dependent Claims (2, 3, 5, 6, 7, 10, 11, 12, 13, 14)
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4. A method for manufacturing a semiconductor device comprising the steps of:
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forming a gate electrode layer; forming a gate insulating layer over the gate electrode layer; forming a metal thin film over the gate insulating layer; forming an oxide semiconductor layer over the metal thin film; dehydrating or dehydrogenating the oxide semiconductor layer and oxidizing the metal thin film entirely; forming an oxide insulating layer which is in contact with a part of the oxide semiconductor layer and covers a peripheral portion and a side surface of the oxide semiconductor layer; forming a source electrode layer and a drain electrode layer over the oxide insulating layer; and forming a protective insulating layer which is in contact with the oxide insulating layer, the source electrode layer, the drain electrode layer, and the oxide semiconductor layer. - View Dependent Claims (8, 9)
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15. A method for manufacturing a semiconductor device comprising the steps of:
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forming a gate electrode layer; forming a gate insulating layer over the gate electrode layer; forming a metal thin film over the gate insulating layer; forming an oxide semiconductor layer over the metal thin film; patterning together the oxide semiconductor layer and the metal thin film; heating the metal thin film and the oxide semiconductor layer wherein the metal thin film is oxidized at least partly; forming an oxide insulating layer in contact with a part of the oxide semiconductor layer and covering a peripheral portion and a side surface of the oxide semiconductor layer; and forming a source electrode layer and a drain electrode layer over the oxide insulating layer. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method for manufacturing a semiconductor device comprising the steps of:
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forming a gate electrode layer; forming a gate insulating layer over the gate electrode layer; forming a metal thin film over the gate insulating layer; forming an oxide semiconductor layer over the metal thin film; heating the metal thin film and the oxide semiconductor layer wherein the metal thin film is oxidized at least partly; forming an oxide insulating layer in contact with a part of the oxide semiconductor layer and covering a peripheral portion and a side surface of the oxide semiconductor layer; forming an opening in the oxide insulating layer so as to expose a part of the oxide semiconductor layer; and forming an electrode electrically connected to the oxide semiconductor layer in the opening. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A method for manufacturing a semiconductor device comprising the steps of:
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forming a gate electrode layer; forming a gate insulating layer over the gate electrode layer; forming a metal thin film over the gate insulating layer; forming an oxide semiconductor layer over the metal thin film; heating the metal thin film and the oxide semiconductor layer wherein the metal thin film is oxidized at least partly; forming a first insulating layer in contact with a part of the oxide semiconductor layer, wherein the first insulating layer includes oxide compound materials; and forming a second insulating layer over the first insulating layer, wherein the second insulating layer includes nitride compound materials different from the oxide compound materials of the first insulating layer. - View Dependent Claims (28)
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Specification